🔠 Case Converter

Instantly convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.

Your text

UPPERCASE

HELLO WORLD — CONVERT ME!

lowercase

hello world — convert me!

Title Case

Hello World — Convert Me!

Sentence case

Hello world — convert me!

camelCase

helloWorld—ConvertMe!

PascalCase

HelloWorld—ConvertMe!

snake_case

hello_world_—_convert_me!

kebab-case

hello-world-—-convert-me!

CONSTANT_CASE

HELLO_WORLD_—_CONVERT_ME!

aLtErNaTiNg

hElLo wOrLd — cOnVeRt mE!

iNVERSE cASE

hELLO wORLD — cONVERT mE!

Understanding Case Conventions in Programming and Copywriting

Capitalization is not just style — in writing it signals tone and hierarchy, and in code it is often enforced by convention or the language itself. Here is when to use each.

When to Use Title Case vs Sentence Case

Title Case capitalizes the first letter of each major word (nouns, verbs, adjectives) while leaving short articles, conjunctions, and prepositions lowercase — for example, “How to Calculate Tips and Split a Bill.” It is traditional for book titles, headlines, and formal headings.

Sentence case capitalizes only the first word and any proper nouns — for example, “How to calculate tips and split a bill.” Most modern digital products, UI copy, and publications (including Google and many newsrooms) prefer sentence case because it reads as friendlier, is faster to scan, and is easier to apply consistently.

Rule of thumb: use Title Case for formal or marketing headlines, and sentence case for buttons, tooltips, app copy, and body-driven digital content.

Developer Naming Conventions: CamelCase, PascalCase, and Snake_Case

Programming languages and frameworks each favor specific casing styles for readability and consistency:

camelCase — first word lowercase, later words capitalized (getUserName). Standard for JavaScript variables and functions.
PascalCase — every word capitalized (UserProfile). Used for React components, classes, and types.
snake_case — lowercase words joined by underscores (user_name). The convention for Python variables and many database columns.
kebab-case — lowercase words joined by hyphens (main-header). Standard for CSS classes, URLs, and file names.

Matching your project’s convention keeps code predictable and reduces bugs from mismatched identifiers.

How This Tool Works

A case converter transforms text between different capitalization styles instantly. It supports uppercase (ALL CAPS), lowercase (all lower), title case (Each Word Capitalized), sentence case (First word capitalized), camelCase (used in programming), and other common formats. This is useful for writers reformatting headlines, developers converting between naming conventions, data entry corrections, and anyone who needs to quickly transform text without retyping it manually.

💡 Tips & Best Practices

1Title case typically does not capitalize articles (a, an, the), short prepositions (in, on, at), or conjunctions (and, but, or) unless they start the title.
2camelCase and PascalCase are programming conventions — camelCase starts lowercase (firstName), PascalCase starts uppercase (FirstName).
3Many email subject lines perform best in sentence case — it looks natural and professional.

Frequently Asked Questions

What is the difference between Title Case and Sentence Case?

Title Case capitalizes the first letter of most words (e.g., "The Quick Brown Fox"). Sentence Case only capitalizes the first word and proper nouns (e.g., "The quick brown fox"). Title case is used for headings; sentence case is used for normal text.